#include<iostream>
using namespace std;
int main()
{
    long double a = 0;
    long double b = 0;
    long double c = 0;
    while (cin >> a >> b >> c)
    {
        if ((a + b > c) && (a + c > b) && (b + c > a))
            cout << "Yes" << endl;
        else
            cout << "No" << endl;
    }
    return 0;
}